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Mayweather says he's the best ever as Rousey takes aim

Floyd Mayweather Junior has never been associated with humility and boxing's pound-for-pound champion again showed why during a TV appearance where he insisted he's the greatest fighter ever.

The 38-year-old, who has a 48-0 record, appeared on ESPN Deportes ahead of the final fight of his career against Andre Berto where he put himself at the top of a questionable list of the five greatest fighters of all time.

Before revealing his list from the 10 options given, Mayweather explains that there's no room for "bias" before choosing himself as the greatest.

"I'm going to explain why, one reason, two reasons or three reasons?" he asks one of the hosts.

"He's beaten more world champions than anyone on that list, he's done it in a shorter period of time than any other fighter up here and he's done it with less fights than anyone up here,” Mayweather says while referring to himself in the third person.

Unbeaten fighter Floyd Mayweather has promised to repay any losses talk-show host Jimmy Kimmel suffers if he loses his fight against Conor McGregor.

When asked about Muhammad Ali's claims to be the greatest fighter ever, Mayweather says the three-time heavyweight champion was beaten by Leon Spinks, who had just seven fights to his name at the time.

While his choice for the greatest fighter ever is no surprise, the rest of Mayweather's list will have boxing experts scratching their heads.

He included Roberto 'Hands of Stone' Duran (103-16), Pernell 'Sweet Pea' Whittaker and Mexico's modern-day great Julio Chavez Junior (49-2-1-1) in the list before completing the top five with Ali.

The omissions of 'Sugar' Ray Robinson and Henry Armstrong, widely regarded as two of the best pound-for-pound fighters ever, in particular will stun fans of the sport.

While Mayweather was out promoting the final fight of his career against Berto, women's UFC star Ronda Rousey continued her feud with the unbeaten boxer by saying she would definitely beat him in a no-rules fight.

"Floyd is one of the best boxers of all time, he would definitely beat me in a boxing match. I unfortunately don't get into 'matches.' I fight for a living," Rousey said on Reddit.

"In a no-rules fight, I believe I can beat anyone on this planet."

"Boxing is a sweet science with strict rules that I respect very much and aspire every day to improve at. But you said rule-less fight, and that's my honest answer," the UFC women’s bantamweight champion added.